Melt butter.,Add beef, onion, garlic and mushrooms.,Cook until meat is browned, stirring to break up.,Drain.,Add lemon juice, bouillon cubes and water.,Simmer, uncovered, 10 minutes. Add noodles (uncooked).,Cover and simmer 15 minutes or until tender.,Add more water, if necessary.,______,Stir in sour cream and heat gently.,Sprinkle with paprika and parsley. Serves 4.